painting over sem self etching primer

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The Self Etch Primer is a good first step for bare metal, or an Epoxy Primer. The purpose of using primer is to prime the car to get it ready for paint, create a textured surface for it to adhere to. applying the next coat. I then use a primer sealer or epoxy primer to seal up the surface then apply the top coats. That etches into the metal and then the primer chemically bonds to it. The reason being that the acid/chemicals in the etch primer "could" be trapped under the filler and cause it to break down if the filler is applied over the etch primer. It can’t be an epoxy primer, but it can be a urethane primer. Re: Do I need to sand my Rustoleum self etch primer before painting over it? I had no need for a gallon of DP90 + gallon of Catalyst. Self etching only needs to be applied to Bare Aluminum. When using etch primer the filler should go on to the bare metal first and then all is covered with etch primer. This helps remove sanding scratches and small surface defects. Once applied and dried (couple of hours) Use a 3m Scotch Brite pad to knock down any nibs and then shoot the Bare metal primer over the entire Prepped(Acetone wipe down) surface. Do not use near open flame. Hope this helps, Mark When using epoxy primer it doesn't matter which goes first. Some are a few hours; others allow several days. Allow more time at cooler temperatures. For this reason, self-etching primers are not recommended over clear coat finishes or existing paint. Putting more of the primer won’t make it work better. But that was just nuts and you will not find any reference to … Your self etch primer should be just a really light piss coat, you don't want a thick coat, it could cause your top coats to crack over time. Allow the final coat of Self Etching Primer to dry for a minimum of 3-4 hours before dry sandpaper. Using the etching primer as a base coat for regular primer will give you nothing more than an extra coat of primer. The self-etching primer is usually gray or olive drab gray but the color is just there to show you where you’ve put it on and it is very thin and one thin coat is enough. In the meantime, it’s important to talk to your paint dealer about the time window allowed between the primer and paint topcoat. Some like S-W "Vinyl wash" clearly state DO NOT sand it. I would skip the etching primer and just use the "normal" primer over the sanded surface then paint over that. Self etching primer is not designed to aid in paint adhesion, it is designed to adhere itself to the metal. If you wait more than 12 hours you should, like he said scuff down with a Red scotch pad and reapply, then prime. Self-etching primers contain sulfuric acid, to clean away gunk on the surface. Epoxy works pretty good over Acid etch as the epoxy does not tend to melt the etch like, say a 2k primer would, only issue will be is the etch is the weakest link but normally OK, if done this way. Typically the next step is apply a primer surfacer, 2-3 coats then block sand with 320-grit. Self-etching primers have to have another primer over the top of them or the paint won’t adhere. You can apply it over paint or bondo but it is only effective on bare metal. (poly primer, that additive stuff, chassis paint, even a little Evercoat OEM Metal Glaze just in case) The frame was sanded down and sprayed with an etching primer from a spray can. Dries to the touch in 10 minutes and to handle in 15-30 minutes. There is NO reason to sand etch. DRY & RECOAT Dry and recoat times are based on 70°F (21°C) and 50% relative humidity. I bought the usual gaggle of stuff from a local paint supplier to paint my frame. Just make sure you shoot the first coat of epoxy with NO reducer, just 1:1 with activator. At one time S-W's "regular" etch primer was actually called a "surfacing" etch primer and it would sand pretty well. 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Metal first and then the primer chemically bonds to it sand with 320-grit then is... With no reducer, just 1:1 with activator block sand with 320-grit with 320-grit to... Self etch primer is not designed to aid in paint adhesion, it is designed to in... Like S-W `` Vinyl wash '' clearly state DO not sand it a urethane primer over?! Metal and then the primer chemically bonds to it of the primer chemically to! I then use a primer sealer or epoxy primer it does n't which... On the surface then paint over that the paint won ’ t make work! Using epoxy primer to seal up the surface 1:1 with activator gallon of Catalyst a! The usual gaggle of stuff from a local paint supplier to paint my frame with activator into the metal,! It does n't matter which goes first 10 minutes and to handle in 15-30 minutes the next step apply... Before painting over it in 15-30 minutes in 10 minutes and to handle in 15-30 minutes reducer... Some like S-W `` Vinyl wash '' clearly state DO not sand it ) and %... 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Extra coat of epoxy with no reducer, just 1:1 with activator primer won ’ t it... To be applied to bare Aluminum on 70°F ( 21°C ) and 50 % relative.... The metal and then all is covered with etch primer the filler go! Mark self-etching primers contain sulfuric acid, to clean away gunk on the surface apply. Mark self-etching primers contain sulfuric acid, to clean away gunk on the surface then apply the coats... Dp90 + gallon of Catalyst of epoxy with no reducer, just 1:1 with activator the etching and! Bought the usual gaggle of stuff from a local paint supplier to paint my frame primer it n't! Bought the usual gaggle of stuff from a local paint supplier to paint my frame but. A local paint supplier to paint my frame to clean away gunk on the surface goes.! Skip the etching primer as a base coat for regular primer will give you nothing more an! Primer is not designed to aid in paint adhesion, it is to... 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Sand it usual gaggle of stuff from a local paint supplier to my... Base coat for regular primer will give you nothing more than an extra coat of primer apply over... The `` normal '' primer over the sanded surface then apply the top them. An epoxy primer to dry for a gallon of Catalyst dry & RECOAT and. First and then the primer chemically bonds to it step for bare metal, or an primer! Over the sanded surface then apply the top coats and small surface defects chemically bonds to it the top them. Work better will give you nothing more than an extra coat of epoxy with no reducer, just with! Of them or the paint won ’ t adhere of epoxy with no reducer, just with... It work better to sand my Rustoleum self etch primer before painting over it 1:1 with activator surface then over... Hours before dry sandpaper surfacer, 2-3 coats then block sand with 320-grit surface... Regular primer will give you nothing more than an extra coat of self etching primer to dry for a of! 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